Activating swap

[Andrew Ivanov <c680789@showme.missouri.edu>]

Evening all.
I am trying to setup a secondary swap partition on a different IDE
controller in my system. I partitioned the drive, inserted 
/dev/hdc5   none    swap   sw pri=0  0 0
into the fstab ( I may be putting the pri=0 option in the wrong place, but
it works with the first swap partition)
But when I boot, I get 
Unable to find swap-space signature for the /dev/hdc5
and swapon produces Invalid argument message, when trying to either 
swapon -a or swapon /dev/hdc5
How do I activate that swap?

TIA,
  Andrew